install-deps.sh: keep debian alternatives

install-deps.sh: keep debian alternatives

Instead of removing the | when an alternative is found in the control
file such as

     cryptsetup-bin | cryptsetup

remove the surrounding spaces so that it is treated as a regular
expression that matches either one.

Replace the form

    sudo bash -c "FOO=bar ..."

with

    sudo env FOO=bar ...

to reduce the levels of shell escaping.

Reported-by: http://dyweni.com/
Signed-off-by: Loic Dachary <ldachary@redhat.com>